Organs for grasping woof threads in inserting elements of stationary woof frames



United States Patent Inventor Ramon Balaquer Golobart Calle Valls yTaberner 11, Barcelona, Spain Appl. No. 740,934 Filed June 28, 1968Patented Oct. 6, 1970 Priority July 13, 1967 Spain No. 343,664

ORGANS FOR GRASPING WOOF THREADS IN INSERTING ELEMENTS OF STATIONARYWOOF FRAMES [50] FieldofSearch ..l39/122 127 [56] References Cited 7UNITED STATES PATENTS 3,140,731 7/1964 Jones... 139/126 FOREIGN PATENTS1,391,346 1/1965 France 139/122(N) Primary Examiner-Henry S. JaudonAttorney-Christen & Sabol ABSTRACT: A gripping mechanism for pulling theweft 5 Claims 7 Drawing Figs thread through a loom is mounted on the laybeam of the loom U.S. Cl 139/122 and is provided i h j mem rs actuatedby cam Int. Cl D03d 47/20 mechanisms at opp site ends of the laybeam.

Patented Oct; 6', 1970 3,532,136

Sheet 1 of8 Patented Oct. 6, 1970 3,532,136

shed ofa loom.

Elements for .inseningweft threads includeaiance, rod or flexible strip,which is reciprocatorilyrnovedthrough the sh ed of a loom to whose frontend can be attaohed various types of mechanisms for gripping the weftthread, such as a hook, a loop or a clip. 7

These inserting elements usually need foroperatingthejaws h t ma th e tr d p n pe oh omplic e mechanisms in the area of gripping the weftthread at the mouth of the inserting element or else, must useremotecontrols; all of these arerather b ulky andheavy, which ..eausedifficulties in applying other elements that arevital fonmalring cloth,such as selvage makers, cutting elements, suction elements, etc., andlead to diff culties in catching .the weft h eads w th dan o .de'hes thew e e d heh said mouths or jaws" pass thro responding mechanisms.

h Pr se i veh e h m a e m nati th ee rawhaeks and the lack of safety ,byperforming with absolutereliability the task of the gripping mechanism,by,means @dfllicethat is extremely simple and free vof flaws, that doesaway completely ,with remote controls, that operates with greatsimplicity, that can be applied to any type of insertionkelement,whetherthey are rigid, .for exa mp l e, a rod or lance, or flexible, asfor example asthip or band, and that ,inno way prevents the applicationof other elements that are vital for making cloth, such as selvageformers, cutting and suetion elements, etc While a the e met me de w thehvd hserq sl mage o h w p h eaqe whe th ipp ng lement p se throu theshed. v r

The device, which is the object of the present invention, is m d up of esh ppi m hanism with h el hs te b s i e a bayonet which in the vicinityof its tip has attached a stop of ugh the shed .with their cor;

y ieldablc material whichmakes up a stationary jaw, andiapx m te i h setler 9 th en h r said ele ates bas there s a lie e Pi w i h piv tally'sppsrt a woar e e the end of the front arm of the lever serving to makethe movable jaw press the weft threads against the yieldable stop, andthe end of the back arm of said layer carrying a hinge joint for a rod,the free end of which is introduced so as to slide in a housing housedin a hinge joint ofa member that is fixed to the lengthened base, therod-hinge joint unit being actuated by a recoil helicoidal spring thatautomatically causes the oscillation movement of the lever in bothdirections, for opening and closing of the mobile jaw. Said bayonetlikeelongated base is also covered with a protecting shield along its wholelength, which prevents, as it passes through the shed, the elements of ts pi theehhhi from eve n t e a p h ehd and damaging them.

- k The e d O p te t e ti of the e h ted ase an he fi m y.

attached to any type of inscrter element, whether it is rigid, as forexample, a rod or lance, or flexible, for example, a strip or band.

For a better understanding of the invention, there is described below,with reference, to the accompanying drawings an embodiment by way ofnonlimiting example.

FIG. 1 is a perspective view of the gripping mechanism in p h es t eehteh h e t ea with. the P otes e fe the warp threads cut away along itsentire length for greater visibility ofthc components.

2 is per ee v f st ppihsme h hism of FIG. I, also in closed positionwith the protector for the warp threads cut away.

G- 3 s per pect e f he g pping, m c nism. e responding to FIG. 2 butwith thef protcctor for the warp threads in place.

FIGS 4 and are details of the spring-rod unit in the open, and closedpositions ofthe mobile jaw ,2 FIGS .,6,and. 7 are schematic plan viewsof the operation of the gripping mechanism on each side of the loom,with the protector forthe .warpthreads cut away along its-cntire=lerigthfor greater visibility of the components.

.In these figures, the gripping mechanism comprises a iengthened-bayonetlike shaped base, indicated ,bymimeralj'l providedlwithlengthwise wings Zand 3 bentrat right angles along one side and withalengthwise wing 4, also.at ri ght an .gles, but on the opposite side,the latter being bent :again at rightangles, at a. slight distancerabovethe base to overlie ,itin parallel relationship to constituteaiprotector -5,,for the 'warp threads, having ,c utouts ,6, FIG. 3,which besides eliminating weight, provide an outletfor dustorchaffwhichthe:repeated contactwiththeweft thread.7. can cause. I

The base and thewingdqboth ,terminateatthe forwardend in,a p oint 8 andadjacent;this.end,there1is attached-to the base ,a stop .9, made of arelatively yieldable material; positioned against the wing 4 toconstitute thestationary jaw of the gripping mechanism. Alever 11 1,having opposing arms lZand l 3 is supportcd at a medialpoint for pivotalmovementon a pin -l0 at tached ;to,the base at a distance fromits'forwardrend 8. The arm 11:2terminates in a slightly curved,clawtshapedgportion 15 .havingan irregularly curved surface :on-itsinnerrcon- ,vex portion whichcoacts with a complementariiyformedsurfaceon the stop-9 ,tograspa weft thread7. Thetotheranm 13 of thelever terminates in a horizontal flat surface l-l6;having a margin onthe outwardly facing side which rtapers inwardly (for a purpose whichwill be explained later) and Qanendmar gin which is provided with ,aninwardly curved recess 17 to serve as a bearing for the ball shaped endportion IS-of a rod 19. The other end 20 of this rodisslidablyrcceivedwina bore provided in a small housing 2'! which housinghas a generally spherical end surface which is, .in turn, received in .ahorizontally extending curved recess';2 2 formed in transverselyextending member 23 attached to base land spaced, rearwardly from the.end 16 0! the pivotal lever 11. I

Rod 19 is surrounded by ,a recoil helicoidal spring 24, the ends ofwhich bear respectively against the end portion 18,02 the rod and thehousing 21 and, since the spring is under compression, tends to urge thehousing 2I away from the end portion 18 at all times.

The rod 19 and the cooperating spring 24 act as a snap-action devicewhich not only holds lever 11 in each of its two extreme positions, asexemplified respectively in FIGS, 1 and 2, but causes the lever to movealmost instantaneously from one of these two positions to the otherwithout noticeable delay.

The end 27 of the base 1 is provided with openings 30 to receivefastening members, such as screws 29, for attaching the grippingmechanism to a reciprocating arm 28 of a loom.

The operation is as follows:

During weaving of the cloth, the gripping mechanism, controlled by arm28, FIG. 6, is introduced into shed 36 to engage the end of the weftthread 7 coming from a bobbin 37, with movable jaw 1,4 separated fromstationary jaw 9, or in the open position, until it reaches the feedside of the loom, where the outer curved part of the movable jaw 14 hitsstop 31, u ed n loom fra e of housing Zl against the force of spring 24until a medial point is reached between the extreme positions of thelever, at

which point no further shortening of the distance between housing 21 andthe ball shaped end 1 8,.wili occur. During all of the pivotal movementof lever 11 the ball shaped end 18 will merely pivot in the recess I7but the spherical housing Z lv at the other end of the rod, which waslocated at the outer end. of. curved recess 22 at the st t? of movementof the lever (FIG. 5), will not only pivot on the surface of the recessbut will also engage in a. slight transverse shifting movement in therecess (FIG. 4,) at about. the time the spring Ztthas reached maximumcompression due to, shortening of the distance between the end portions.of rod. 1 9. At this position the pivot: point represented by recess 17will pass. over a line extending;

between the pivot point represented by housing 21 and the pivot point oflever 11, allowing the spring 24 to begin ex-,

pansion and urge the free end of rod 19 to slide out from the bore inhousing 21 and in the process quickly continue the further clockwisemovement of lever l 1 until the end 16 of the arm has reached itsextreme position, as shown in FIGS. 4 and 7, with the movable grippingjaw 14 in engagement with the stationary jaw 9 and gripping a weftthread 7 therebetween.

When the gripping mechanism, controlled by arm 28, pulling weft thread7, returns and is introduced again into shed 36 and reaches the otherside of the loom, FIG. 7, the projection of butt end 16 of arm 13 oflever 11, strikes stop 35 housed in loom frame 34, again causingcompression and expansion of the recoil spring 24, and shifting ofhousing 21 but in the opposite direction, forcing end 20 of rod 19 tomove in side its housing 21 and causing the instantaneous separation ofmobile jaw 14 from stationary jaw 9, releasing weft thread 7. When thegripping mechanism makes its return trip, loose end 33 of weft thread 7will slip through claw 15, said weft thread 7 being completely insertedalong the entire length of the shed.

The details and characteristics used in embodying the objects of thepresent invention may be-varied in accordance with the scope of theinvention, and also the recoil helicoidal spring may be replaced by twofacing magnets, located in the side wings of the lengthened base, allstill being within the scope of the invention, as defined in the annexedclaims.

I claim:

1. In a weft gripping means for a weft inserting element of a loom, thecombination comprising an elongated base, one end of the base beingprovided with a bayonet-shaped tip, a stationary jaw on said baseadjacent said one end, a doubleended lever pivotally mounted at a medialpoint on said base, one end of said lever having an arm provided with amovable 5 jaw coacting with said stationary jaw for gripping a weftthread therebetween when in gripping position, and spring meansconnected between said lever and said base for urging said leverselectively in either direction to hold said movable jaw in gripping ornongripping position.

2. The invention defined in claim 1, wherein said spring means includesa rod and a recoil helicoidal spring surrounding said rod, one end ofsaid spring being connected with said double-ended lever, the other endof the spring being connected with said base.

3. The invention defined in claim 2, wherein said lever is provided witha recessed portion for receiving one end of said rod in swingingabutting engagement therewith, and said base is provided with housingmeans within which the other end of said rod is received in swinging andlongitudinally slidable engagement.

4. The invention defined in claim 1, wherein said one arm of the leveris curved for engagement with a stop, said stop being provided at oneside of a l'oom to urge said lever toward the gripping position.

5. The invention defined in claim 4, wherein the other end of said leveris curved for engagement with a second stop, said second stop beingprovided at the other side of a loom to urge said lever toward thenongripping position.

